RUDI GUNAWAN, SYA’AD AFIFUDDIN, SIROJUZILAM, RAHMANTA. Investigation of Trade Interactions Effect of North Sumatera with Malaysia and Singapore: An Application of Autoregressive Distributed Lag (ARDL) Model. International Journal of Advanced Science and Technology, v. 29, n. 7, p. 1699 - 1715, 16 May 2020.